T"nB CSM40BL. Device interface: 3.5 mm, Cable length: 2.2 m. Ear coupling: supraaural, Headphone frequency: 20 - 2000 Hz, Impedance: 32 Ом. Microphone frequency: 30 - 16000 Hz, Microphone sensitivity: 54 dB, Microphone input impedance: 20000 Ом. Cables included: RCA